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NTP stratum

NTP servers are normally set in /etc/ntp.conf.

It may take up to 4 hours of semi-continuous reachability to calibrate the clock before you achieve right stratum status. If the stratum status hasn’t changed in a few hours, your synchronization is definitely failing.

From synchronization with stratum 2 servers, your stratum should settle at stratum 3.

You can check your stratum status (and other info):

ntpq -c readvar

You can check what peers you are connected to (and in turn what they are connected to):